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Is just a comment... there to let you know that the code directly below the comment is being passed from the $xoops_module_header value (which is assigned to (not necessarily defined in) the active .html template that you are viewing).
To better understand, open header.php from cbb, you will see $xoops_module_header getting populated (or for the sake of this discussion...defined).
open (still cbb) index.php... you can see $xoops_module_header being assigned to the template here.
As long as you are not using module wide cache, at this point (with $xoops_module_header assigned from a php page to a .html (or smarty) template) whatever is assigned to $xoops_module_header will show up in the(compiled) page header.
Open your theme.html file from your active theme and you will see...
somewhere between the line above and will be:
<{$xoops_module_header}>
This is there so to facilitate what I described in my earlier post and above(module specific css... more specifically passing header information from a module page to be wrapped in the header by theme.html). Some very old themes will not have this code... they will also not pass module header information (unless you add above code in the head section).
Hope that shines some light